Bridgestone recently updated their Turanza Serenity to the Turanza Serenity Plus in most sizes. Compared to the previous Serenity, the tread pattern has retained the same general layout with some slight modifications to the shape of the grooves and sipes. Bridgestone has incorporated design elements they call Resonance Noise Attenuated (RENOA) silencer grooves. These are designed to reduce tread noise by trapping sound within the tread pattern rather than transmitting it out to the surrounding area.
We have just completed a test of Grand Touring All-Season tires that included the Serenity Plus as well as several competitors. While the final results have not yet been compiled and written up, the Bridgestone proved to be very smooth and quiet over the road.
I also had the opportunity to test it on the track and they were very stable and predictable under the stress of track conditions. My track driving was under dry conditions, but we will be publishing the full test results within the next few weeks.
If you're looking for a smooth and quiet all-season tire, the Bridgestone Turanza Serenity Plus is definitely worth a look. With 29 sizes available in a low rolling resistance option, the Serenity Plus can help contribute to better fuel economy.